Asimov’s Calculation and the Possibility That the World Is Growing Too Fast

by Claudio Bresciano

In 1962, Isaac Asimov mentioned a calculation that was as simple as it was unsettling.

If the world’s population continued to grow indefinitely at roughly 2.2% per year, the consequences would eventually become physically absurd. Within a few centuries, the total mass of humanity would be comparable to the mass of the Earth. Continue the same progression for a few more millennia, and human mass would exceed the mass of the observable universe itself.

Of course, Asimov was not making a prediction. His purpose was to illustrate a fundamental mathematical truth: no exponential growth can continue forever within a finite system.

Yet more than half a century later, we still organize much of our societies as if permanent growth were a law of nature.

The Religion of Growth

Both the political left and right often repeat the same idea in different forms.

A country has problems because it is not growing fast enough.

An economy fails because it is not expanding rapidly enough.

A society falls behind because it cannot keep up with the pace of the world.

The diagnosis changes depending on ideology, but the conclusion is remarkably similar:

We must accelerate.

Speed becomes synonymous with progress.

Yet we rarely stop to ask a more fundamental question:

What if the problem is precisely the speed itself?

The Case of Uruguay

Uruguay is often described as a country that failed to keep pace with the world’s most dynamic economies.

Its population grows slowly.

Its domestic market is small.

Its economic expansion is modest compared to many developing nations.

From the conventional perspective, these characteristics are signs of stagnation.

But there is another possible interpretation.

Perhaps Uruguay is not unusually slow.

Perhaps the world has been unusually fast.

For much of the twentieth century, humanity experienced an extraordinary phase of expansion fueled by exceptionally cheap and abundant energy.

What appeared normal may, in fact, have been a historical anomaly.

Living Off the Savings Account

The key to modern growth was not technology alone.

It was energy.

For decades, oil provided extraordinary energy returns. Some of the major oil fields of the twentieth century yielded nearly one hundred units of usable energy for every unit invested in extraction.

This was an exceptional situation.

Today, in many cases, that ratio has fallen dramatically. More and more energy must be spent to obtain the same amount of energy.

The difference is comparable to living off an inherited savings account.

As long as the reserves are enormous, prosperity appears limitless.

But eventually the capital begins to shrink.

At that point, an uncomfortable question emerges:

Are we creating wealth, or are we simply consuming more rapidly an energy inheritance accumulated over millions of years?

A Planet Financed by the Future

Studies of ecological footprint suggest that humanity currently consumes resources at a rate exceeding the Earth’s annual capacity for regeneration.

The metaphor is straightforward.

If the planet can sustainably provide one Earth’s worth of resources per year, but humanity consumes the equivalent of 1.8 Earths, the difference does not disappear.

It must come from somewhere.

Forests that will take decades to recover.

Aquifers that require centuries to replenish.

Fossil fuels that took millions of years to form.

Topsoil that erodes faster than it can regenerate.

The balance sheet appears positive in the present because part of the cost has been transferred to the future.

The Illusion of Infinite Growth

Modern economic history is deeply shaped by an intuition inherited from the nineteenth century:

More production means more well-being.

For a long time, that intuition seemed correct.

But every exponentially growing function eventually encounters physical limits.

Population.

Energy.

Minerals.

Waste absorption capacity.

Arable land.

Every finite system imposes constraints.

The question was never whether those limits exist.

The question was when they would begin to become visible.

The Real Challenge of the Twenty-First Century

Perhaps the central debate of our era is not how to accelerate further.

Perhaps it is how to distinguish growth from sustainability.

For two centuries, humanity learned how to expand.

Now it may need to learn something far more difficult: how to stabilize.

Societies often interpret deceleration as failure.

Yet in engineering, biology, and ecology, systems that grow indefinitely tend to collapse.

Stable systems are those that find a balance between expansion and constraint.

The question therefore changes completely.

It is no longer:

Why are some countries failing to keep up with the world?

But rather:

What if the real problem is that the world is trying to maintain a pace that no finite system can sustain indefinitely?

Asimov’s calculation remains as unsettling today as it was in 1962.

Not because humanity will literally become a sphere of flesh the size of a planet.

But because it reminds us of a simple truth we often prefer to ignore:

Nothing can grow exponentially forever in a finite universe.

The question is not whether limits will appear.

The question is whether we will recognize them before they recognize us.